The exotic inim block of the argun continental superterrane of the central asian fold belt: results of U-Th-pb geochronological (LA-ICP-MS) and Sm-Nd isotopic-geochemical studies

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Abstract


The results of studies indicate that the age of the protoliths of garnet-bearing biotite–sericite–muscovite schists of the Inim Block is <991 Ma, and they are derived from rocks of the Neo-, Meso-, and Paleoproterozoic (as well as Archean) crust. This suggests that the Inim Block is exotic relatively to the Argun Superterrane due to the formation of the protolith of its metasedimentary rocks largely from erosion products of the Early Precambrian continental crust, the presence of which within the Argun Superterrane is not proven. It is not excluded that the Inim Block is a fragment of the Dzhugdzhur–Stanovoi Superterrane implanted in the structure of the Argun Superterrane as a result of Mesozoic tectonic events.


About the authors

R. O. Ovchinnikov

Institute of Geology and Natural Management of Far Eastern Branch of Russian Academy of Sciences

Author for correspondence.
Email: Ovchinnikov@ignm.ru

Russian Federation, 1, Relochniy lane, Blagoveshchensk, 675000

A. A. Sorokin

Institute of Geology and Natural Management of Far Eastern Branch of Russian Academy of Sciences

Email: Ovchinnikov@ignm.ru

Russian Federation, 1, Relochniy lane, Blagoveshchensk, 675000

A. B. Kotov

Institute of Precambrian Geology and Geochronology of the Russian Academy of Sciences

Email: Ovchinnikov@ignm.ru

Russian Federation, 2, Makarova embankment, St.Petersburg, 199034

E. B. Sal'nikova

Institute of Precambrian Geology and Geochronology of the Russian Academy of Sciences

Email: Ovchinnikov@ignm.ru

Russian Federation, 2, Makarova embankment, St.Petersburg, 199034

V. P. Kovach

Institute of Precambrian Geology and Geochronology of the Russian Academy of Sciences

Email: Ovchinnikov@ignm.ru

Russian Federation, 2, Makarova embankment, St.Petersburg, 199034

A. P. Sorokin

Institute of Geology and Natural Management of Far Eastern Branch of Russian Academy of Sciences

Email: Ovchinnikov@ignm.ru

Russian Federation, 1, Relochniy lane, Blagoveshchensk, 675000

Corresponding Member of the RAS

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